I'd like to know the purpose of MOS (maintenance override
switch). At site, these switches are installed in a
stanchion with the transmitter (connected to ESD). thank

Answers were Sorted based on User's Feedback

Hi, I'd like to know the purpose of MOS (maintenance override switch). At site, these switch..

Answer / wael salah

maintenance override function is used for bypassing shutdown
processing so that it is not executed by safety logic during
partial maintenance such as specific input.Creating bypass
logic using a dedicated override allows the (HIS) to safely
perform maintenance override for SCS (system control station)
However Maintenance override can not executed from the HIS
unless this switch is in the permission status.

Is This Answer Correct ?    21 Yes 0 No

Hi, I'd like to know the purpose of MOS (maintenance override switch). At site, these switch..

Answer / seba

MOS is used for enabling /disabling (permision to bypasing
shutdown signal from ESD system.once it enabled you can
overide perticular loop or swtich or function block.
MOS is installed normally on DCS and activating by DCS
operator or concerned engineer for allowing maintenance
technician to perform calibration or replacement of faulty
switches and transmitters.

Is This Answer Correct ?    19 Yes 2 No

Hi, I'd like to know the purpose of MOS (maintenance override switch). At site, these switch..

Answer / winter r

I want a example defeat of control sheet about when
something is verride .

Is This Answer Correct ?    1 Yes 2 No

Post New Answer

More Instrumentation Interview Questions

How to calculate 47Liter H2 Gas cyilnder consumtion? Cylinder inlet Pressure is 200bar and Discharge pressure is 6.0bar. Flow is 100ml/min.For the above condition how many days one cylinder can be used?

1 Answers  

what is surge and how is it prevented, what is the purpose of bypass valve across AS valve.

0 Answers   ADMA OPCO,

why does mA signal preferred for signal transmission?

12 Answers   Emerson,


2 Answers   IOCL,

What is the Flow rate ?

2 Answers  

If hart communicator provide 4-20ma source to any transmitter during the callibration?

3 Answers   Hyundai,

How much should be the values and/or percentages of these given below factors for a good controller ? Steady state error Delay Rise Time Overshoot Peak Time Settling Time Damping Oscillations & vibrations thanks

1 Answers  

what is transducer?

13 Answers   Sofcon,

what is mean by live zero and dead zero

3 Answers  

HI, can anybody give details about GAS TREATMENT PLANT CONSTRUCTION,as INSTRUMENTATION ENGINEER what are the responsibilites.what are the instruments mainly instrumentation engineer will deal with

0 Answers   IOCL, GSM,

what is the difference between transmitter and converters?

9 Answers   Videocon,

What is the main difference between Cavitation and Flashing?

1 Answers  

  • Civil Engineering Interview Questions Civil Engineering (5069)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4441)
  • Electrical Engineering Interview Questions Electrical Engineering (16577)
  • Electronics Communications Interview Questions Electronics Communications (3915)
  • Chemical Engineering Interview Questions Chemical Engineering (1091)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (214)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (258)
  • Instrumentation Interview Questions Instrumentation (2986)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (122)
  • Power Plant Engineering Interview Questions Power Plant Engineering (170)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (0)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1376)